feat(approval): add task workflow and waiver decisions

server/src/app/main.py

@@ -1,9 +1,9 @@
 from __future__ import annotations
 
+import threading
 from collections.abc import AsyncIterator
 from contextlib import asynccontextmanager
 from logging import Logger
-import threading
 
 from fastapi import FastAPI
 from fastapi.middleware.cors import CORSMiddleware
@@ -16,9 +16,9 @@ from app.db.session import get_session_factory
 from app.middleware.logging import AccessLogMiddleware
 from app.schemas.common import RootStatusRead
 from app.services.agent_foundation import prepare_agent_foundation
+from app.services.approval_task_scheduler import approval_task_scheduler
 from app.services.digital_employee_reminder_scheduler import digital_employee_reminder_scheduler
-from app.services.employee import prepare_employee_directory
-from app.services.employee import EmployeeService
+from app.services.employee import EmployeeService, prepare_employee_directory
 from app.services.employee_profile_scheduler import employee_profile_scheduler
 from app.services.finance_dashboard_scheduler import finance_dashboard_scheduler
 from app.services.finance_report_scheduler import finance_report_scheduler
@@ -34,7 +34,11 @@ from app.services.user_session_metrics import UserSessionMetricService
 def _effective_server_workers(settings: object) -> int:
     server_workers = getattr(settings, "server_workers", None)
     web_concurrency = getattr(settings, "web_concurrency", None)
-    workers = web_concurrency if int(server_workers or 1) <= 1 and web_concurrency else server_workers
+    workers = (
+        web_concurrency
+        if int(server_workers or 1) <= 1 and web_concurrency
+        else server_workers
+    )
     try:
         return max(1, int(workers or 1))
     except (TypeError, ValueError):
@@ -100,6 +104,7 @@ async def lifespan(_: FastAPI) -> AsyncIterator[None]:
     schedulers_started = _should_start_background_schedulers(settings)
     if schedulers_started:
         knowledge_index_scheduler.start()
+        approval_task_scheduler.start()
         finance_dashboard_scheduler.start()
         employee_profile_scheduler.start()
         digital_employee_reminder_scheduler.start()
@@ -118,6 +123,7 @@ async def lifespan(_: FastAPI) -> AsyncIterator[None]:
     )
     yield
     if schedulers_started:
+        approval_task_scheduler.shutdown()
         finance_report_scheduler.shutdown()
         digital_employee_reminder_scheduler.shutdown()
         employee_profile_scheduler.shutdown()